This SIG Sauer factory style replacement barrel is ideal for shooters wanting to gain more versatility from their sidearm. Capable of being inserting in standard SIG Sauer P229 handguns, this drop in barrel is chambered in .357 SIG and provides excellent accuracy. Switching calibers is as easy as dropping in this barrel and changing magazines. Features hammer forged rifling and a heat treated design. Blued steel, .357 SIG.